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Background  Low temperature limits the growth and development and geographical distribution of plants.  Poa pratensis  is a cool-season turfgrass mainly grown in urban areas. However, low winter temperature or cold events in spring and autumn may cause  P.pratensis  mortality, affecting the appearance of lawns.  P.pratensis  var.  anceps  cv. Qinghai (PQ) is widely distributed in the Qinghai-Tibet Plateau above 3000 m. PQ has greater cold tolerance than the commercially cultivated  P.pratensis  varieties. However, existing studies on the response mechanism of PQ to low temperatures have mainly focused on physiological and biochemical perspectives, while changes in the PQ transcriptome during the response to cold stress have not been reported.    Results  To investigate the molecular mechanism of the PQ cold response and identify genes to improve the low-temperature tolerance of  P.pratensis , we analyzed and compared the transcriptomes of PQ and the cold-sensitive  P.pratensis  cv. ‘Baron’ (PB) under cold stress using RNA sequencing. We identified 5996 and 3285 differentially expressed genes (DEGs) between the treatment vs control comparison of PQ and PB, respectively, with 5612 DEGs specific to PQ. Based on the DEGs, important Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways, such as “starch and sucrose metabolism”, “protein processing in endoplasmic reticulum”, “phenylalanine metabolism” and “glycolysis/gluconeogenesis” were significantly enriched in PQ, and “starch and sucrose metabolism”, “phenylpropanoid biosynthesis”, “galactose metabolism” and “glutathione metabolism” were significantly enriched in PB. In addition, the “glycolysis” and “citrate cycle (TCA cycle)” pathways were identified as involved in cold tolerance of  P.pratensis .    Conclusions  As we know, this is the first study to explore the transcriptome of  P.pratensis  var.  anceps  cv. Qinghai. Our study not noly provides important insights into the molecular mechanisms of  P.pratensis  var.  anceps  cv. Qinghai responds to cold stress, but also systematically reveals the changes of key genes and products of glycolysis and TCA cycle in response to cold stress, which is conductive to the breeding of cold-tolerance  P.pratensis  genotype.

Physiological and transcriptome analysis of Poa pratensis var. anceps cv. Qinghai in response to cold stress